Method for producing phosphor powder, phosphor powder, and light-emitting device

A method for producing a phosphor powder according to the present invention is a method for producing a phosphor powder containing an inorganic compound in which Eu is solid-solved as an activator in an inorganic crystal having the same crystal structure as a crystal represented by Ba26Si51O2N84 or a crystal represented by Ba26Si51O2N84. The method for producing the phosphor powder includes: a mixing step of mixing raw materials including elements constituting the inorganic compound to obtain a raw material mixed powder in which the molar ratios of Ba, Si, and Eu in the raw material mixed powder are set as a, b, and c, respectively, b = 51 and a/b > (26-c)/51 are satisfied; a calcining step for calcining the raw material mixed powder to obtain a calcined product; and a cleaning treatment step in which the calcined product is subjected to acid treatment and/or water treatment. 本发明的荧光体粉末的制造方法是含有无机化合物的荧光体粉末的制造方法，上述无机化合物是在具有与由Ba26Si51O2N84表示的结晶、或者由Ba26Si51O2N84表示的结晶相同的晶体结构的无机结晶中固溶有Eu作为激活剂而成的；所述荧光体粉末的制造方法包括：混合工序，将